package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @Author WeiJinLong
 * @Date 2023-08-20 16:17
 * @Version 1.0
 */

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        1.获取请求头中的token
        String token = request.getHeader("Authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }
//        2.基于Token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
//        3.判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
//        5.将查询到的hash数据转为userDto对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
//        6.存在 保存信息到ThreadLocal
        UserHolder.saveUser(userDTO);
//        7.刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);
//        8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
